condition mean min max ZT0-3 8.05 8.05 8.05 ZT4-7 17.8 17.8 17.8 ZT8-11 2.55 2.55 2.55 ZT12-15 27.700000000000003 27.700000000000003 27.700000000000003 ZT16-19 18.45 18.45 18.45 ZT20-23 8.7 8.7 8.7